I agree with guidenet here. It would be way better to get a further macro than a teleconverter. What you want from macro shots are sharpness and great IQ. The TCs would affect that.
Having said that, if you need the teleconverter, the Kenkos are great.
|Madrid subway by MAGMATCICO62|
from Your City - Public Transport
|Incandescent Bulb by Kukla|
from Illuminate- Macro only
|Curiousity by PERCY2|
from Macro - Your Best Macro Ever
|Hoar Frosted Trees by sabishiT3T|